Making cities more sustainable is a top priority – for national governments, for cities and for the people who live, work and visit urban areas. The past decade has seen a concerted UK effort to develop, apply and assess sustainability solutions for the present and near future; however, little has been done to test urban regeneration solutions beyond that. This paper describes a methodology that has developed future scenarios for the year 2050 against which to test the robustness of current engineering solutions, thereby providing unique insights into the potential impacts of present urban planning and design decisions, and thus financial investments. If a proposed solution delivers a positive legacy, regardless of the future against which it is tested, then it can be adopted with confidence. When there are very different outcomes depending on the future, the solution can either be modified to create an improved outcome regardless of the future or implemented in the knowledge of the likely impacts if the future develops in different ways. The urban futures methodology has been applied to the Lancaster Luneside East regeneration site, for which contextual information is described along with a justification for its use as a case study to trial the methodology.